The Topeka Capital-Journal reports (http://bit.ly/19T9alM ) that Aaron Estabrook says he is forming an exploratory committee to look into running against Roberts, who’s up for re-election in 2014.

Estabrook, an Army veteran, works at the Salvation Army as a case manager for homeless veterans in northern Kansas. He says he’d run under the banner of the “Moderate Party of Kansas,” a political action committee he co-founded last year. He ran unsuccessfully for the Kansas House as a Democrat last year.

Roberts spokeswoman Sarah Little says Roberts doesn’t take any election for granted “and will continue to fight for Kansans each and every day whomever his opponent may be.” Roberts is a Marine Corps veteran.